FEM MaterialMechanicalNonlinear: Difference between revisions

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Creates a nonlinear mechanical material. Currently, only plasticity with simple hardening is available.
Creates a nonlinear mechanical material. Currently, only plasticity with simple (isotropic) hardening is available. {{Version|0.22}}: Kinematic hardening is also available.


==Usage== <!--T:9-->
==Usage== <!--T:9-->
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# To edit an existing MaterialMechanicalNonlinear object:
# To edit an existing MaterialMechanicalNonlinear object:
#* Select it in the [[Tree_view|Tree view]].
#* Select it in the [[Tree_view|Tree view]].
#* Select the material model (currently, only simple hardening is available).
#* Select the material model (isotropic (simple) hardening or {{Version|0.22}}: kinematic hardening).
#* Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the {{Button|...}} button next to {{PropertyData|Yield Points}} to input the points using a user-friendly list. The syntax is described in the [[#Notes|Notes]] section.
#* Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the {{Button|...}} button next to {{PropertyData|Yield Points}} to input the points using a user-friendly list. The syntax is described in the [[#Notes|Notes]] section.


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* In FreeCAD 0.19 and older versions, only 3 yield points can be specified. Since version 0.20 a list of yield points can contain as many as required.
* In FreeCAD 0.19 and older versions, only 3 yield points can be specified. Since version 0.20 a list of yield points can contain as many as required.
* The syntax should beː
* The syntax should be:

{{Code|code=
</translate>
: {{Code|code=
stress_1, 0
stress_1, 0
stress_2, plastic_strain_2
stress_2, plastic_strain_2
...
...
}}
}}
<translate>


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with dot as the decimal separator since that's what CalculiX uses.
: With dot as the decimal separator since that's what CalculiX uses.


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For exampleː
: For example to define a bilinear model with hardening for S275 steel:
{{Code|code=

</translate>
: {{Code|code=
275, 0
275, 0
490, 0.2
490, 0.2
}}
}}
<translate>
To define a bilinear model with hardening for S275 steel orː

{{Code|code=
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: Or, to define perfect plasticity with no hardening for this material:

</translate>
: {{Code|code=
275, 0
275, 0
}}
}}
<translate>
To define perfect plasticity with no hardening for this material.



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Revision as of 11:00, 5 March 2024

FEM MaterialMechanicalNonlinear

Menu location
Model → Materials → Nonlinear mechanical material
Workbenches
FEM
Default shortcut
None
Introduced in version
-
See also
FEM tutorial

Description

Creates a nonlinear mechanical material. Currently, only plasticity with simple (isotropic) hardening is available. introduced in version 0.22: Kinematic hardening is also available.

Usage

  1. To create a new MaterialMechanicalNonlinear object do the following:
  2. To edit an existing MaterialMechanicalNonlinear object:
    • Select it in the Tree view.
    • Select the material model (isotropic (simple) hardening or introduced in version 0.22: kinematic hardening).
    • Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the ... button next to DataYield Points to input the points using a user-friendly list. The syntax is described in the Notes section.

Notes

  • In FreeCAD 0.19 and older versions, only 3 yield points can be specified. Since version 0.20 a list of yield points can contain as many as required.
  • The syntax should be:
stress_1, 0
stress_2, plastic_strain_2
...
With dot as the decimal separator since that's what CalculiX uses.
For example to define a bilinear model with hardening for S275 steel:
275, 0
490, 0.2
Or, to define perfect plasticity with no hardening for this material:
275, 0